I'm not sure I understand your definition of "constant speed". When I read "constant speed", I think of (let's say) 65mph on the flat, 65mph up the hill, and 65mph down the hill. If you are talking about a "target average" speed of 65mph for the trip, where you are under the average on the uphill and over the average on the downhill, then that sounds like it is compatible with DWL.
In my case, I also do Pulse & Glide... despite going faster than my average speed on the pulse, and gliding down below my average speed afterwards, I still have a target average speed.
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